Abrasive stone holder



May 7, 1935. M. N. PRANGE ABRASIVE STONE HOLDER Filed March 12, 1934 QUHQJ WWWMW ATTORNEYS Patented May 7, 1935 UNITE-D 4 2,000,611 7 ABRASIVE STONE Bonita" p I I Maurice N. Prange, Detroit, I Application Marcli. ;l2,1934-,; Swami-[15.2w

7 Claims. (o1. 51 -184'.1)"

This invention relates to annabrasivewstone holder or abrasive element ,for. grinding tools,- and has as its objects tosimplify; render-more efficient, and improve generally devices of this character.'

One of the important. objects of the invention is, to provide a backing member for abrasive stones having novel and, improved means for anchoring the abrasive element therein '.together with simple but eifective means ,for positioning the backing member relative 'to. the abrading-.element1receiving member of the hone or grinding tool.

The above, as well as other objects of the invention, together with the novel details of construction, will be made more apparent as this description proceeds, especially when considered in connection with the accompanying drawing, wherein Figure 1 is an end elevation of a honing tool provided with my improved abrasive stone holder;

Figure 2 is a perspective view of the backing or channel member;

Figure 3 is a side elevation thereof with the abrasive element secured therein;

Figure 4 is an enlarged transverse sectional view taken substantially on the plane indicated by line 4-4 in Figure 3;

Figure 5 is a similar view taken substantially on the plane indicated by line 5-5 in Figure 3;

Figure 6 is a top plan view showing my improved abrasive element including the backing member associated with the abrasive element receiving member, and

Figure 7 is a view similar to Figure 6 with the positioning means carried by the backing member engaging the end faces of the receiving member.

Referring now more particularly to the drawing wherein like reference characters indicate like parts, it will be noted that there is illustrated in Figure 1 a rather conventional form 45 of honing tool I0 provided with a plurality of radially extending outwardly opening recesses H in which a corresponding number of abrad-- .ing element receiving members l2 are mounted for radial adjustment in any preferred or desired manner by means not shown herein as it forms no important part of this invention.

' My improved abrasive element comprises a relatively shallow channel or backing member I3 in which the abrasive element or stone [4 5 is adapted to be secured. The channel backapertures ;|5:-in-i theybause thereof. and. with one or more 'apertures liiilibifihfl or'both of the side flanges -thereof.; In practice, I may employ only the apertures I51 or onlythe apertures IE, or I may provide boththeapertures I5 and I6, as illustrated. I

The abr'asivestone isformed. inthe channel by means of. a moldior the like'and when moldingthe stone in the channelthe material from I as shown at I9 in Figure 7, to engage the end faces of the receiving members I2 to thus position the backing member and abrasive stone in the receiving member. These extensions l9 are preferably bent laterally into engagement with the end faces of the'receiving member I2 after the backing member with the abrasive stone seated therein has been positioned in the receiving channel of the receiving member.

This obviously provides an eflicient but simple means for preventing relative longitudinal movehoning member ID, extensions 2! are provided K on the backing member or channel, which extensions are provided with apertures 22 to receive the ends of springs 23 which, as will be obvious, hold the abrasive elements in assembled relation but permit radial adjustment thereof.

The dowel pin-like projections 11 assist in anchoring the abrasive element against longitudinal movement relative to the backing member, whereas the dowel pin-like projections l8 effectively anchor the abrasive element against longitudinal and perpendicluar movement with respect to the channel backing member. Moreover, by molding the stone in the backing mem-. ber an integral unitary structure is produced.

While the embodiment of the invention herein illustrated has been found in practice to produce satisfactory results, nevertheless reservation is made to make such changes in the jing member may be provided with one or more I 3. An abrasive element for a grinding tool comprising a channel member having apertures in the base and side flanges thereof and an abrasive stone secured in said channel and hav ing portions thereof projecting into-said apertures.

4. An abrasive element for a grinding. tool comprising a channel member having an aperture extending through one wall of the channel, and an abrasive stone within the channel provided with an integral dowel extending into the aperture for securing the stone within said channel member. 1

5. In an abrasive unit for a honing tool, a channel member, an abrasive stone having integral projections extending laterally therefrom, a retainer for the stone engageable in the first channel and comprising a second channel member having openings therethrough for receiving the projections on the stone to secure the latter thereto and having projections extending laterally from opposte ends thereof engageable with the extremities of the first channel to prevent relative longitudinal movement between the channel members.

6. In an abrasive unit for a honing tool, a channel member, an abrasive stone having laterally extending integral projections thereon, a retainer for the stone engageable in the channel member and comprising a second channel ;member having apertures therethrough for receiving the projections on the stone to secure the latter thereto, and lugs projecting laterally fromthe extremities of one of the channel members for engaging the ends of the other channel member to prevent relative longitudinal movement of said members.

7. In an' abrasive unit for a honing tool, a channel member, an abrasive stone having integral laterally extending projections, a retainer for the stone engageable within the channel of said member and comprising a second channel member having openings therethrough for receiving the integral projections to secure the stone thereto and having lugs projecting laterally outwardly from the extremities of the side flanges of the channel for engaging the opposite ends of the side flanges of the first named channel. 1 '1 MAURICE N. PRANGE; 

